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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a60ef88e4c8943c7d11ddc417989ea4cc92787491860d890dead9c769e9125' 
  AND token = 'YfQEb6e15iHisV8dnKe0FhFmhHH8hIAX4pIskxy8CSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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