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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febdd06b0995f5b99d28338ca1de9b993389fcf0efefcac15f68161e90e1602f' 
  AND token = 'had2m1sddsOJvs/QHd6puGBe/LX+F9dBwTLTsv4I1kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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