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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238db8beed69a79179b1690ce6ccb0a837fb007694709c97e7709d2254b9630c' 
  AND token = 'A0xK0Xn4clDFLiIV++ktdrchRsjYQ72ajEdIl1XG3As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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