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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f716f5000b28332d4e0c782dad4e22f9a79ae8c37c3c7202aafe057f98e53b41' 
  AND token = '07n8Zlt4N1gf1rgExgrHRo4XlH7Aglj/R0OUjMJi4No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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