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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa184d52baa0a69a4429a384f9895a1bc11640ecb58ecc503fce4ec943d6126f' 
  AND token = 'E5euCrbysdn9ufCV1XFzHF1PfFYO9mVfQBFL9665dOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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