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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd550e69674b03416d80e5091e77f3d80f5b3f9b42798d45ffce26b6250cbdd7e' 
  AND token = '14Z9QTJSsfocpHm50rd0ywwuyNAqdLKdokr1B837X+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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