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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5486d0772d5a1bf8b9d61493c0a3621e5ee2433acbe88e66ba161ab1692af58e' 
  AND token = 'FIlpLQG8X4vbNUk1tFtdx4CT2lvuQ98BibVhx6TAep0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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