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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdee048767e913d20f4b8e706e6af98d1d340d30c50e6fd2c517fde1570d93fb' 
  AND token = 'RKl9LlrhQRpGpsWSc1K4PHnG+pAR0giF3vBvnqF0cHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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