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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537fdb9756a679f45ac3a85653d39263fab0c557d231d7d7bbc2b96df11524ef' 
  AND token = 'vBxGAClMp0+iZR3dS7kOyRI6QgO5jPYPqiqTSZdMYAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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