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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7848a2ed3bea0036da5c5c0b093955642b9c4fbb6be59d0605230b27cb424114' 
  AND token = 'N+N+UvcP6CQ8jUV0Q0hkZo5syRgLT2t65VcZBOlEGG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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