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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa18771a822423b1141ec7d601a7a101e57b558b09e91312de502db63a78fbf' 
  AND token = '3CA9x69lQCDMbENlL4l5jSgXOaYM8Mmv+i2Aeb+C6PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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