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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4559c49a98779a9143e5042d688ebd235c190cb7687a87c534659d7ce25225b9' 
  AND token = 'Fvrmtula/OXEsTOB7F3Rh1RXHRSE5md5FYn8NjGwGPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}