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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54eb7f08638134632180a5f91eeb533fdc80e20370114ad565f349e93432da6c' 
  AND token = 'l2axNglo4rin6Mm+0hPoYQ+5AywWzTNPrt3UvpBUakQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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