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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968aeb26cd207d16e9b09d9c97fd1a0c429bcf54b0bd1d776dc14820014eb965' 
  AND token = '3+3VsODY9BTQU19ek4Xd0eSTr7BAMHOoDbXkrBQk3a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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