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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e4c243c8af95b89bedf8321b2ed1d49ba6824c477c848fed0633d28004d760' 
  AND token = 'C4gscJVBnTDw0kueex/e0s0KOIwMmJe1o60vHPfAC3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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