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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a632994145e75af0b3cc5d5e90f1431081b0d1b112a967964b5ad8b30cec40d3' 
  AND token = '6JuELjPva+EbQvWIo+jx3o73fTRJ1Qqi5JgnxcWlbSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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