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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b935bbddcff11b58439eece9a6d78bd0e37a8e0ae2c89f63d25a62a3fd6a867a' 
  AND token = '35U63Fl9gXZkFEP5xK1e+lAb8bhsJvaJFd99XVZS4XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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