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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eebf852e85734e8072307648b6b2c817589f334fd9dec0cce7df25e757c1c81' 
  AND token = 'Dx+agN6K6TClPj0uzc81R+cwXsTmOkwQsnm9W8KRwe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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