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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3bfe25eb38296665757c44a99369af8a62e1f6a4a69f20aea348d6961136b6' 
  AND token = 'yK5d11ykfMX0sq0sPQMxP7vDlQtq/VklSM7Yp+BI1Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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