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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61732300c8dff7e3bf6e11783e63ff585f08d7d13ba83b8f6144756b436fc398' 
  AND token = 'jekJgvOZyYZ+Suts+9+8SIdKr53qhy+K686I38s4LQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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