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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdae5aee088e4780499ce2f2c2d079860d44f8f23c2b24dc29f7ac69c55725e6' 
  AND token = '4Cic3jIg3W856Od7rlbBmDZ8jL6FPdssODl4yzpUJ/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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