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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5622bf7be29ffd283bf62861d223d1017d0c3e55a01c19071d3da399abeb02' 
  AND token = 'H3Lba28llb4u+FB3nqZcHzL5E0KNuYT/MZ/V5XZMnV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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