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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5901e7ed14fe32b4f154fb12db81589f83a3c35e910dc78abfa2945149f9b5d5' 
  AND token = '72kNQKu+CjovCL0nHCnzHO3ut2Czjxvu3Y1KOJZSDQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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