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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d3e7d114cb8ce09d5d89a09dc88eee5b56301f2c1b42bda217bbc8d4f669cd' 
  AND token = 'edaUK2Oc20vx0AySesLZIoOkzwq3nC6MO1hI7FKikZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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