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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54118ccb4b97df030efc182872956ca599549d20425e0d4db4b25acc8f453046' 
  AND token = 'HBurH5w2U5kX4zpSGshOJ7Cq9cia87DnlpiEr7gUbik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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