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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766658f5ec193978370a7d4c2d5f9165a256db4b1ebad93ce7b2a13bfa55499e' 
  AND token = 'pbTHCiIS7NHkTSp57EMgI/ymA+iBXUs4YgTeDAMBJiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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