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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6459855c4c4e7bdddb6c4b0c0bef9034a8ec35f929d60fc78d51dcb6dd98d218' 
  AND token = '3Juz3b4jw63Go5TjvI/ohemwk+8wx1mky/CrOhApZGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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