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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5615f423b7889531ca24ed13b70f4702aae7064c5950782234e7c3c38d40f940' 
  AND token = 'iy/COPRgMES4N9erzOClI8YHlPOuwWHS6UWB1b/tOa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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