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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89be02cdef23d10ad6e9abac570e3a9d2052d1a25cc7778734ed287b24b45bb' 
  AND token = 'Iftdn9TMR4R7ObH01fbYFaxHFgBSm0eYq1URCNyrODw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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