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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95033442ff86a12f28b57a02958d61377cd6cffb92a23dc9d1dab4e061acbf20' 
  AND token = 'jqFFLO+5aWMmXHr4K24kDvl8sO5U/j95OpwrrfK/IfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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