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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136d3a77a3af6b296d4a9959fdcd62ee515efb2889cc6c4d6bf3fbf13ac83159' 
  AND token = 'yYI0reCel/w8Npe4Sf0/+cqnd5dR9DXPAGDrAk/L52o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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