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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbbb8d4ab4d26fb95a253cf1e97ab62b0b85bd07fcc62143fddbbe4e2df2d82' 
  AND token = '5JzemoNmx3GmUiZgZ5fcB0x5nvEQAdo38C8DzmivZv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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