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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b40a5baf9ab9028a83634bf4697154fbc045e3b1a5a24a5d6bdebe06e8f82f' 
  AND token = 'OpRLvbQ8RbylgsZPvbmARyMfKRw9/oOQ9GFBgBjj7v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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