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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13e5fa13ab1b7ca47780d4f22ed4423802ab3996eeb4e5c2a17eece72c47e8d' 
  AND token = 'snp5wmJshWm7DVkOACpuU27SwQ7JZlXHCTgM+mue03o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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