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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfb213f40360f644f692f109b48125ca0f10dfdc1536db22d67f76ddda7f38c' 
  AND token = 'jhnddlLLJn0A8b8qubyPn8b6XKR8cEmbdgcYPNFlY4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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