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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac3fb232834d57e0141e0b261a801a014a1bdab1d1e184ef93024b13c7bd9e4' 
  AND token = 'KeIzajgfm2702rP/IFvnsCzzj3+prW7JYpoFkeItVFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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