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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6416e61a8488d3f439275e20fef179f05995cfb06df8ce03f9083b244f2a89' 
  AND token = '9LX2IaLgcLmuwgIp08Qz0qpq0uH4YYCZeBNo0pR90/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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