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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b8e875be41160e7fadd940fcedf89a5341166f9468f7fe4ea8c89d13a9c2ef' 
  AND token = 'COoWi5uRIy+Nw9V947N+OWYmF5toX31+ZpOY8N7k4P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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