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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1c696fc41285126cd1e8105de6cbccf27dd8545fe2a92ad69dd8ce24cf1b3c' 
  AND token = 'M+Povym06U8tODEA+JABs7EMaDEaWi/25BwabcBvkxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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