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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939dbbf7762375cd9942d57b54fe031c366b376e2f4bd0f1c3e7bbbea4d89e7c' 
  AND token = 'VTXfw3qTZDgitPgcQ+9NQuYdjJ0vW1Q0PlZ5lX4WuFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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