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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7f47f1fe4118911679af7f7c7488d024820e2ff5a7a2cdacc3e5e16a4e568f' 
  AND token = 'wtloHxZRnXYboGrx9NMHPq7QoPEOIwEmLrklqafdUAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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