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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b71ac8d34bd20f2153df740b8e7a579c94f3b4e9fa3fa8aca6840580ac5c102' 
  AND token = 'l9Su9oEvCEfeLYpzCJpBuuc58UpaY2IylK46LSu7dp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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