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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acceea12887c73147fd81657bb64dd8c832a928d2c70e25f1bef4ea0b3e1ee7' 
  AND token = 'VoTf2xPT+lb2r6DLXKvUmwfgPOEFFqc3lD+ai4Ks7k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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