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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8d4e38f02b36f0eb56cf4d0d1d76d74f0ca06055b1a0be113ccd729bc41102' 
  AND token = 'l3dp8KCqQ2CJGL/72KPjK7P3W997Q3Wuk+OgIoQI3zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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