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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c17581a0a7927eb3a6ea42c28753d66fbadf664a0b77ca98227b43a490fb1b' 
  AND token = 'WVblM4vTyPIJ8BFRrkqIsD+ENQfQOWmoEt3Q581A5/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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