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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665d9d646b6bb1c2ddba33cde2cf58bf7e642a8cc085fe4d43b1626d0719e61f' 
  AND token = '9TnVI/s03InuRzzDAkYdg+1nOEWhymnOYyrLgESCxKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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