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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb92c9854416d96c747783d2702996642450af2a49be677edb3163b82bc582c' 
  AND token = '/C1fIf6pgBs0p66JfvGHsD+6NR+N3dJ2XMTDUF1pEos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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