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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d9dc20dd0efbbc97c449ba9bb932ae108e28a4526bc640dc88fbaa7b261641' 
  AND token = '3rN11+eR1ATEPtJFw+IXPlR8P4U/TfIVnJUXGAqyyXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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