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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69252552743b2a16d8b4a00d6477bf29ca58ace1f8a2554c1dcd784de46f405' 
  AND token = 'PedAO789w8aGXwVJffCR6saMMC002BxXzCvYoniDw3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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