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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef53cbe78f7eb22b4562a872b03e5662ef31cb0e9a2295acd1a4114888cb0a71' 
  AND token = 'lobRY/kymALOq/q0REMW+WczBU4HHkZM8+xM5SZiHO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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