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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dedf458874caecb3d321a06d7b25e1a6f62b66a6fde3c5ce091d7b57cc7e959' 
  AND token = 'wbfoSW8XZ9+tXdIsUX1xbjjw2I9/n/g5hjKH2i5WeZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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